YAKIMA — Noble Stoneman had overcome a traumatic head injury during childhood to recently graduate from Washington State University with a degree in electrical engineering, and had a job lined up in Montana. But the 25-year-old Naches Valley High School alum’s plans came to a tragic end earlier this month when he fell from a cliff at Palouse Falls and was swept over the 198-foot-high torrent. Now, his mother, Ruth Drollinger of Naches, wants the state to close the park until it can figure out how to prevent anyone else from dying on the cliffs or in the pool at the base of the falls. “I call that place a death trap,” Drollinger said, noting her son is the fourth person to die there in the past two years.